Wow. That sounds like a blast. Have heard some Barbershop & knew it is a US college tradition, but had no idea about the brigades.
As a curious aside, saw a thing on television just this evening about a Portuguese musical tradition which exists in their universities. The style & tunes are very different to Barbershop, and they make use of string instruments as well (though everybody has to sing) but they too have familiar repertoire and appear at various events on campus, as well as competing with other university troupes.
Bit behind the times here, but how are cars even accessing this information, unless the phone is built into the car system, and the user has an cellular/data/wi-fi account with the car manufacturer?
If it were me, I’d use that browser solely for FB. Firefox allows one to have multiple instances. Harden it as much as you can whilst still able to use the bits of FB you’re interested in.
Keeping him unblocked but muted, just in case he threatens to approach. Having forewarning (and evidence if it really escalates) is useful & my feelings are now such that he’s incapable of upsetting me.
Garmin sell these beacon devices, which can be used to either check in with relatives, or to summon help to their location.
They’re expensive, and intended more for people heading into remote areas, but might give you both some peace of mind, without tracking his every move.